Piston-meter



I (No Model.)

W. A. SYLVESTER.

PISTON METER.

,342. Patented Nov. 1, 1887.

YX/ET E5 55 N PETERS. Fhom'umographcr, Washington, n.c.

UNITED STATES PATENT Grates.

W. ALLEN SYLVESTER, OF CHELSEA, MASSACHUSETTS.

PISTON-METER.

SPECIFICATION forming part of Letters Patent No. 372,342, dated November 1, 1887.

Application tiled March 9, 1887. Serial No. 230,203. (No model.)

To all whom, it may concern:

Be it known that I, W. ALLEN SYLvEsTER, a citizen of the United States, and a resident of Chelsea, in the county of Suffolk and State of Massachusetts, have invented new and use ful Improvements in Tater-Meters, of which the following, taken in connection with the accompanying drawings, is a specification.

The invention refers to improvements in reciprocating pistonmeters, and particularly to automatic valve mechanism for the same; and it is carried out as follows, reference being had to the accompanying drawings, wherein- Figure 1 represents a central longitudinal section of my improved water-meter. Fig. 2 represents a cross-section on the line A B, shown in Fig. 1; and Fig. 3 represents a horizontal section on the lineOD, shown in Fig. 1.

Similar letters refer to similar parts whereverthey occur on the different parts of the drawings.

The meter-shell is composed of the central water-chamber, a, and bored-out cylinders a and a", as usual.

b and b arethe heads or covers at the outer ends of the respective cylinders a and a;

c and c are the reciprocating pistons, secured to or made in one piece with the pistonrod 0, as is common in Huid-meters of this kind.

a is the top plate, as usual, having the supl -o aenin a connected b means of a suit liquid that has been measured, as usual.

F is the main valve-cylinder or valve-receptacle containing the reciprocating main valve by which the liquid in the central chamber, a, is alternately conducted to the ends of the cylinders a a and from the latter to the exhaust e.

F and F are the heads or covers secured to opposite ends of'the valve-cylinder F, as shown. The valve-cylinder F is secured on its under side to the upper side of the bottom In addition to such eXhaust-portf, there are on opposite sides of the latter the respective ports or openingsff and f f, as shown in Fig. 1. The portsff are permanently in direct communication with the respective corcdout passages e and ein the bottom plate, E, as shown, and the openingsf f communicate with the central water-chamber, a. In the top of the cylinder F there is an exhaust-port, H,

in direct communication with the main exhaust e by means of the belt-passage H going outside of the shell of the cylinder F, as shown in Fig. 2.

i and i are supply-ports and channels leading from the respective ends of the cylinder F to the upper portion or flat valve-seat of the said'cylinder, and k: k are exhaust ports or channels leading from near-the ends of said cylinder F to the upper portion or flat valveseat of said cylinder, as shown in Fig. 1.

m is the supplementary valve located between the upper portion or valve-seat of cylinder F and the stationary cover L, the latter being secured to the cylinder F by means of suitable screws, or other equivalent devices common in the art.

in and m are horizontal projections or rods on opposite ends of the supplementary valve m, which are actuated by the respective pistons c and c as the latter approach the ends of their inward stroke.

M is a single port in the middle of the supplementary valve m, by means of which a communication is alternately es'tablishedbetween the exhaust-port H and the exhaust-passages 70 k, according to the position of the supple nientary valve m and pistons c c.

It is not essential that the valve-receptacle F and its valve G G G should be made cylindrical, as the .valve aforesaid may be made flat and the receptacle of a corresponding shape without departing from the essence of my invention. \Vhere the exhaust-ports k and 70" enter the cylinder F they are made of a triangular or tapering form, as shown at K K in Fig. 3, by which the exhaust from the cyl inder ends is gradually closed when the valve pistons G G pass by the respective tapering orifices K and K, and thus prevent the usual water hammering and pounding common in valves or pistons of this kind. Ifthe valve is kept from turning around its axis within the cylinder F, or in case a flat valve is used instead of a piston-valve, I may prefer to make a tapering notch or recess in the ends of such valve to take the place of the tapering orifices K K in the valvc-ease F, or I may make such tapering recesses in the valve ends combined with tapering orifices at the termini of the exhaust-ports k is.

In a line with each of the openings or ports fffff in the bottom of cylinder F, 1 pre i'er to make on the interior of the latter annular grooves n n a a" a, as shown in Fig. l, to allow the liquid to flow into such grooves and to cause it to press equally around the circumference of the piston-valve when it passes by any one of such grooves, and thus balance the valve so that it will more freely forward and back without pressing on the lower portion only of the cylinder F.

The operation of the device is as follows: As the piston c approaches the end of its stroke in the direction shown by the arrow, it comes in contact with the projection m on the supplementary valve in and moves the latter to the position shown in Fig. 1, causing the liquid in central chamber, a, to enter port i and righthand end of cylinder F, and by the pressure of the liquid the valve GG G is in stantly moved toward the left in direction shown by arrow in Fig. l, and gradually checked during such motion when the left end of valve disk or piston G passes by the tapering exhaust orifice K, and thus preventing water hammering or pounding in cylinder F. After port K has been covered by piston G the water in the left end of cylinder F acts as a check to limit the motion of the valve, on account of the port or opening 2" being 110w closed by supplementary valve 121, as shown. As the valve G G G moves from right to leit, and before it reaches its limit of stroke in such direction, the liquid in lci'tend of valve-chamber F is partially exhausted through port 7;, valve-opening M, exhaust-port H, and beltpassage H, leading to the main exhaust c, as shown and described. The main valve being now in the position shown in Fig. l, the liquid from chamber a enters cylinder F at f, between disks G and G, and passes through port f into channels 0 and A to the end of the cylinder a, causing the pistons c and c to move in opposite direction to the arrow shown in Fig. l, at the same time as the liquid back of piston 0 passes out through channels A c" and through portf into cylinder F, between valve-disks G and G, and out through opening f, leading to main exhaust c, and during this position of the main valve the port f is closed by the valve portion C. As the pistons c and 0 continue to move toward the right the piston 0 comes in contact with supplementary valve projection m, causing a reversal of the different parts and flow of the liquid, and so on.

In connection with the device I use a suitable registering apparatus, as usual, such registering device being, however, not shown in the drawings.

lVhat I wish to secure by Letters Patent, and claim, is-

1. In a liquid-meter, the chamber a, cylinders a a, and pistons c a, in combination with the main valve-chamber F, its valve G G G, the ports or passages i k t k", and exhaust-port H, lcadingby'means of belt-passage H to the main exhaust e, the supplementary valve in, having single port M and projections m m", and the ports f f in cylinder F, communicating with the chamber a, the ports f f, leading to the ends of the respective cylinders aa, and portf, leading from cylinder .V. ALLEN SYLVESTER.

\Vitncsses:

ALBAN ANDRIIJN, HENRY Crmnnounx. 

